Frivolous funeral?

Whilst travelling up the M1 with my travelling companions the other weekend, I took the opportunity of snapping the following image:



There is no doubt that this is a sidecar hearse. Seeing this got me thinking about funerals in general, and (for example) whether opting to have your coffin transported to the burial site / crematorium in a vessel like this is entirely appropriate. Other instances of funeral frivolity might include tongue-in-cheek song requests and 'edgy' readings at the church. Would things like these upset certain mourners?

When you drill down to it, my key question is: should a person be able to decide on the format and procedures of their own funeral, given that they themselves will not have to endure the event? Alternatively, what is the relevance of the oft-repeated phrase: "It's what he would have wanted", given that 'he' no longer has any ability to appreciate anything through 'his' being deceased?

Please discuss.